Boiler.



PATENTED DEU. 3, 1907.

J. LINDNER.V

APPLICATION FILED HAR. 29, 1907.

2 SHEETS-SHEET l.

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No 872,438 l PATBNTBD DBG. 3, 190'?.

J LINDNER BOILE'R.

APPLICATION FILED MAR za, 1901 z SHEETS-Smm 2.y

A Wwe/wf YS JOHN LINDNER, OF WACONIA, MINNESOTA..

BOILER.

Specification of Letters Patent.

Patented nec. e, 1907.

Application filed March 29.1907. Serial No. 365.427.

To all 'whom it may concern;

Be it known that I, JOHN LINDNER, aciti- Zen of .the United States, residing at Vaconia, in the county of Carver and State of Minnesota, have invented a new and useful Boiler, of which the following is a specification.

This invention relates to steam boilers, and is adapted more especially for use in connection with boilers of traction engines.

One of the principal objects of the invcntion is to provide a novel form of water jacket for the smoke box to be used in place of the castiron lining that is employed in some types of traction engines, this lining being removed and the water jacket forming the subject of the present invention substituted therefor.

A further object of the invention is to pro vide a smoke box jacket having its inner wall so arranged that the products of combustion from the boiler may strike thereagainst for the purpose of utilizing the heat in the formation of steam, provision being made for coupling the lower portion of the auxiliary jacket to the water space of the boiler, and for connecting the steam space of the boiler and jacket in order to promote circulation.

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts, hereinafter fully described, illustrated in the ac companying drawings, and particularly pointed lout in the appended claims, it being understood that various changes in the form, proportions, size and minorl details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings x-Figure 1 is a longitudinal sectional elevation of the forward end of a flue boiler having a smoke box constructed in accordance with the invention. Fig. 2 is a transverse section of the same on the line 22 of Fig. 1. Fig. 3 is a detail section on the line 3 3 of Fig. 2. Fig. 4 is a view corresponding to Fig. 1 illustrating a modiiication.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

In some classes of traction boilers, the smoke box is formed simply by the forward extension of the boiler shell, and in other cases a cast iron or other lining is provided in order to protect the shell. In both cases, however, the heat of the products of combustion at the smoke box is wasted.

In the construction of boiler shown, the boiler A and its forward flue sheet B and smoke stack O may be of the ordinary construction, aud the products of combustion passthrough the tubes and are directed into the smoke box from whence they escape through the vflue C. The forward end of the boiler may be provided with the usual removable head I)` common to boilers of traction engines of this type.

The jacket which forms the subject of the present invention is made as a separate article of manufacture, and includes a cylinder shell 10, an inner wall 15 and opposite heads 1S and 19, thus forming an approximately annular water space 16, the ylower part of which is in communication with the water space of the boiler, and the upper portion in communication with the steam space of the boiler. The upper portion of the lining is preferably in the'form of a flat plate 17 in order to increase the space for the steam, and in this plate is arranged a fusible plug 2O which will be fused in case there is .not sufficient water to cover the sheet. The device is further provided with a smoke stack section 21 which is moved into alinement with the stack Cin order to ermit the free escape of the products of com ustion.

The entire inner wall with the exception of the flat plate 17 tapers or inclines downward from the front toward the rear, so that the water space will be approximatelytriangular in cross section and the inclined surfaces are presented to the streams of gases passing through the tubes in order that the heat of such gases or products of combustion may be thoroughly utilized. At two or more points this inner wall 15 is cut away from front to rear and over this cut away portion are placed curved plates 22 which taper in width from rear to front, so as to form water spaces of relatively large cross sectional area as shown in Fig. 2. Into each of the spaces thus formed extends a water pipe or tube 24, this tube being threaded and screwing through correspondingly threaded openings in the rear head of the jacket, and in the flue sheet ofthe boiler, a suitable stuffing box being screwed on to the tube before the latter is inserted in the openings, in order that a tight joint may be formed. These tubes serve to place the water space of the boiler in free communication with the water space of the jacket.

In order to permit convenient removal and introduction of the tubes 24, the forward head 19 of the jacket is provided with an opening 26 of sufficient diameter to permit the passage of the tubes, these openings being normally closed by suitable hand 'hole cover plates 27.

The steam spaces of the boiler proper and the smoke box acket are placed in communication with each other throughl tubes 30 which screw through suitable threaded openings formed in the rear head of the jacket, and the flue sheet proper, a suitable stuffing box being preferably placed in each of the tubes before it is screwed into place. These tubes are arranged to beintroduced through openings 31 in the jacket head 19, and the openings are then closed by hand hole cover plates 32.

It is found in operation that the products of combustion issuing from theflues F will impinge on the tapered inner walls of the smoke box jacket, and the latter will become more highly heated and thus economize the heat to a greater extent than is possible with the smoke boxes of ordinary construction. The tubes 24 and 30 moreover secure continuous circulation and maintain a constant supply of water within the jacket.

In the construction shown in Fig. 4, the boiler is of the return flue type, where the products of combustion iirst pass through a flue G into the smoke box and thence return through a large number of smaller tubes H in the direction of the combustion chamber. The construction here remains the same as that previously described, with the exception of the tapered wall 17 of the smoke box which is inclined in order to assist to some extent in directing the return of the products of combustion through the smaller flues. In addition to the circulating pipes described, an auxiliary pipe 50 may be employed to place the steam spaces of the boiler proper and the jacket in communication with each other, as indicated in Fig. l.

In use the head D of the ordinary boiler is first removed and the jacket as a whole is l circulating pipes extending through said rear wall and iue sheet.

2. In a boiler lof the class described, a shell, a ilue sheet extending across the shell and dividing the boiler proper from the smoke box, a separate water acket fitted in the smoke box, and of approximately annular form in cross section, the inner wall of said smoke box jacket being tapered, and the inner end of the jacket tting against the flue. sheet, and circulating pipes extending through the end. wall of the jacket and the flue sheet.

3. In a boiler of the class described, a smoke box having a tapered wall and provided with an enlarged channel, and a circulating pipe extending through the forward ue sheet to connect the water space of the boiler with the water space of the smoke box.

4. In a boiler of the class described, a smoke box having a water space, the inner wall of which is tapered to form a water space of gradually increasing area from the forward ilue sheet outward, auxiliary plates forming part of the inner wall of the water space and curved into approximately U shape form in cross section, such plates being tapered in width, and circulating pipes secured in the forward flue sheet and connecting the water and steam spaces of the main boiler and smoke box water space.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

JOHN LINDNER.

Witnesses:

F. J. EFFERTZ, F. F. KLoTH.

Aww. 

